It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 513 618 is not a prime number.
For example, 513 618 can be divided by 2: 513 618 / 2 = 256 809.
For 513 618 to be a prime number, it would have been required that 513 618 has only two divisors, i.e., itself and 1.
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513 618 is an even number, because it is evenly divisible by 2: 513 618 / 2 = 256 809.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 513 618 is about 716.671.
Thus, the square root of 513 618 is not an integer, and therefore 513 618 is not a square number.
The square of a number (here 513 618) is the result of the product of this number (513 618) by itself (i.e., 513 618 × 513 618); the square of 513 618 is sometimes called "raising 513 618 to the power 2", or "513 618 squared".
The square of 513 618 is 263 803 449 924 because 513 618 × 513 618 = 513 6182 = 263 803 449 924.
As a consequence, 513 618 is the square root of 263 803 449 924.
The multiples of 513 618 are all integers evenly divisible by 513 618, that is all numbers such that the remainder of the division by 513 618 is zero. There are infinitely many multiples of 513 618. The smallest multiples of 513 618 are: